acutally you can unlock other cities but it wouldnt be valid, you can take a rhino tank and find a helicopter then take the helicopter over the ocean and into San francisco or las vegas area but you would automatically get 4 stars because you are in a restricted area a place ur not supposed to be in. it takes a whole lot of codes tho. but i was able to unlock them.

Can you start your own gang, and if yes how? Also can you fly airplanes? Can you email me back at Adrenalenaddict@aol.com thanks alot.

yes you can start your own gang after a certain amount of missions you will do a mission that you have to start one all you have to do is aim on the guys in green hanging around the grove then press up on the D-pad then theyll go with you anywere ecept inside places. and yes you can fly planes just to the airport in san fierro and there it is